Code example for ConcurrentMap

Methods: size

        return cache.entrySet();
    public synchronized int size() { 
        return cache.size();
    public synchronized boolean isEmpty() { 
        return cache.isEmpty();
    public boolean isDiskCacheEnabled() { 
        return isDiskCacheEnabled;
     * Retrieves the list of files that are currently cached to disk. Guarantees to never return 
     * null. 
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